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1 Management JBiopest 5(1): of 1-6 rice yellow stem borer, Scirpophaga incertulas Walker using some biorational insecticides Sitesh Chatterjee 1 and Palash Mondal 2 ABSTRACT The experiments were carried out to study the performance of some biorational insecticides against yellow stem borer, Scirpophaga incertulas Walker in Boro rice at Rice Research Station, Chinsurah, Hooghly, West Bengal during the year , and Nine treatments viz. Beauveria bassiana (Panther 4 g/l, Beauveria bassiana ( Myco- 4 ml/l, Metarhizium anisopliae (Nodule Testing Laboratory, 2 g/l, Bacillus thuringiensis(panther 1.5 g/l, Bacillus thuringiensis(nodule Testing Laboratory, 1.5 g/l, Azadirachtin 10,000 1 ml/l, Spinosad 2 ml/15 l, Phosphamidon 40% 1.5ml/l of water and untreated control (Water Spray) were laid out in randomized block design with three replications. The observations on per cent of dead heart and white ear head along with yield of the crop in different treatments were recorded. Spinosad 45%SC proved most effective in managing the insect population as lowest DH% and WE% were observed in all the crop growing seasons. Result on pooled analyses revealed that 80.27% and 67.10% reduction of dead heart and white ear head were achieved over the control by two sprayings of Spinosad 45%SC which resulted in 69.96% increase of yield over the control. Apart from Spinosad 45%SC, Phosphamidon 40% EC also proved better in reducing the dead heart and white ear head as well as in per cent increase of yield over the control. MS History: (Received) (Revised) (Accepted) Key words: Biorational insecticides, yellow stem borer, Scirpophaga incertulas. INTRODUCTION Rice (Oryza sativa L.), is one of the important staple food of more than half of the world population. Production and consumption of rice is concentrated mainly in Asian countries. India, being the largest rice growing country, covers an area of about 44.6 million hectares and produces around 87.8 million tonnes of rice with yield level still low at around 2.85 tonnes per hectare (Anonymous, 2005). A critical analysis of the gap between the potential and actual rice yield across the nation would reveal that several factors act as yield constraints. Among these factors, insect-pests contribute substantially to yield loss in rice production and productivity. In India, approximately 100 insect species feed on rice and 20 of these are considered to be major pests (Cramer, 1967) of which yellow stem borer, Scirpopagha incertulas Walker is the dominant and most destructive pest occurring throughout the country causing yield loss of about per cent (Panda, et al., 1976; Pasalu, et al., 2005). The insect causes Dead hearts at tillering stage and White ear head at reproductive stage. The farmers highly rely on synthetic insecticide as a tool of choice in the battle against this noxious pest because of broad-spectrum activity, relatively low cost and rapid killing attributes. However, like all tools, insecticides have limitations. The excessive and indiscriminate use of insecticides resulted in severe adverse effect on agro-ecosystem, human health and wild life. Now-a-days, to overcome this crisis emphasize has been given on less disruptive control measures with judicial use of pesticides as a last resort. Hence, an attempt has been made to manage this borer insect using some biorational insecticides having selective toxicity and different modes of action as compared to commonly used neurotoxic insecticides. MATERIAL AND METHODS The field experiment was conducted in boro season during , and to study the

3 JBiopest 5(1): 1-6 data thus obtained were subjected to statistical analysis. Appropriate transformation was taken wherever necessary. 145 Table 2. Incidence of white ear head in boro rice in different treatments during , and T 1 : B. bassiana ( Panther BB) T 2 : B. bassiana ( Myco- Jaal) T 3 : M. anisopliae T 4 : B. thuringiensis (Panther BT) T 5 : B. thuringiensis T 6 : Azadirachtin 10,000ppm T 7 : Spinosad 45 SC T 8 : Phosphamidon 40 EC T 9 : Control (Water) % WH (Pre-harvest) WH% (3 yr 1 st yr 2 nd yr 3 rd yr Pooled) % Reduction over control SEm (±) p< RESULTS AND DISCUSSION Dead heart Damage caused by rice yellow stem borer was assessed and injury level was recorded at 30 DAT, 50 DAT and just before harvesting. The experimental results revealed no significant differences in injury level among the different treatments before imposing any management practices. However, observation showed that two spraying at 10 days interval in different treatments registered superior result in reducing DH as compared to control (water spray) in every cropping season. During , lowest % DH was recorded in Spinosad 45 SC treated plot followed by T 8 i.e. Phosphamidon 40 EC. Moderate level of efficacy was recorded with M. anisopliae and B. thuringiensis against the borer insect as 4.53% and 4.82% DH was estimated in each treatment, respectively. Azadirachtin ppm though superior to B. bassiana and B. thuringiensis proved less effective than other treatments. More or less, similar performance was recorded in different treatments during Spinosad 45 SC again proved most efficacious followed by Phosphamidon 40 EC. In the third year i.e. during , slight variation in the efficacy of different treatments was recorded. However, Spinosad 45 SC and Phosphamidon 40 EC again proved better than others (Table 1). Results on pooled analysis exhibited superior performance of different treatments as compared to control. Spinosad 45 SC proved most effective which resuled in 80.27% reduction of DH over the control. Phosphamidon 40 EC registered as second best treatment as 69.36% reduction of DH was recorded. Based on efficacy, other treatments fell into two groups, such as M. anisopliae (T 3 ), B. thuringiensis (T 4 ) and Azadirachtin (T 6 ) in first

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